2010
DOI: 10.1021/ja101502t
|View full text |Cite
|
Sign up to set email alerts
|

Evolution of Structure and Chemistry of Bimetallic Nanoparticle Catalysts under Reaction Conditions

Abstract: Three series of bimetallic nanoparticle catalysts (Rh(x)Pd(1-x), Rh(x)Pt(1-x), and Pd(x)Pt(1-x), x = 0.2, 0.5, 0.8) were synthesized using one-step colloidal chemistry. X-ray photoelectron spectroscopy (XPS) depth profiles using different X-ray energies and scanning transmission electron microscopy showed that the as-synthesized Rh(x)Pd(1-x) and Pd(x)Pt(1-x) nanoparticles have a core-shell structure whereas the Rh(x)Pt(1-x) alloys are more homogeneous in structure. The evolution of their structures and chemist… Show more

Help me understand this report

Search citation statements

Order By: Relevance

Paper Sections

Select...
1
1

Citation Types

15
247
2
4

Year Published

2012
2012
2023
2023

Publication Types

Select...
5
3

Relationship

2
6

Authors

Journals

citations
Cited by 257 publications
(268 citation statements)
references
References 40 publications
(41 reference statements)
15
247
2
4
Order By: Relevance
“…8,9 We find that only core−shell NPs with compositions near 50% Rh have the core−shell reversal induced by O-coverage due to NP geometric size effect, agreeing with observation. 9 The simulated shell concentration of Rh in the small Pd 0.5 Rh 0.5 NP across the same effective O-coverage range also agrees with the experimental data on large NPs, reflecting the same origin from the relative strength of metal−O to metal−metal interactions.…”
supporting
confidence: 88%
See 2 more Smart Citations
“…8,9 We find that only core−shell NPs with compositions near 50% Rh have the core−shell reversal induced by O-coverage due to NP geometric size effect, agreeing with observation. 9 The simulated shell concentration of Rh in the small Pd 0.5 Rh 0.5 NP across the same effective O-coverage range also agrees with the experimental data on large NPs, reflecting the same origin from the relative strength of metal−O to metal−metal interactions.…”
supporting
confidence: 88%
“…8,9 We find that only core−shell NPs with compositions near 50% Rh have the core−shell reversal induced by O-coverage due to NP geometric size effect, agreeing with observation. 9 The simulated shell concentration of Rh in the small Pd 0.5 Rh 0.5 NP across the same effective O-coverage range also agrees with the experimental data on large NPs, reflecting the same origin from the relative strength of metal−O to metal−metal interactions. 8 Our study also reveals the detailed site occupations as functions of both the overall composition and O-coverage, providing design information for nanoalloy catalysts, especially the thermodynamically stable active sites under working conditions.…”
supporting
confidence: 88%
See 1 more Smart Citation
“…7 Lattice strain and relaxation effects were generally considered too small to be important. 6 In the present paper we focus on 10 exploring the changes on going from a bulk material to bimetallic metal nanoparticles, of which heterogeneous catalysts are normally comprised. This changes a number of important factors by essentially diminishing the importance of bulk energy terms relative to surface energy terms on the thermodynamic equilibrium structure of the particle.…”
Section: [Journal] [Year] [Vol] 00-00mentioning
confidence: 99%
“…are very likely to restructure, in order to adapt their geometric and electronic structure to the surroundings. [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24] Such adaption induced from a gaseous or liquid environment could have profound effects on the functions of a catalyst. In many cases, the structure and composition of the catalyst surface in a reactive (or corrosive) environment in which it functions, differs from those in high vacuum.…”
Section: Introductionmentioning
confidence: 99%